CVE-2026-90160 (GCVE-0-2026-90160)
Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-10-19 08:58
VLAI
EPSS
VEX
Title
lwt_bpf: Restore reserved headroom after xmit program
Summary
In the Linux kernel, the following vulnerability has been resolved:
lwt_bpf: Restore reserved headroom after xmit program
ip_finish_output2() expands an skb to LL_RESERVED_SPACE(dev) before LWT
xmit. An LWT_XMIT BPF program can then modify the skb head and still
return BPF_OK, so bpf_xmit() rechecks the remaining headroom before the
skb continues to neighbour output.
That recheck uses dst->dev->hard_header_len. This is not enough for the
neighbour cached-header path: neigh_hh_output() copies the cached hardware
header using the aligned hh_cache size, HH_DATA_MOD for short headers or
HH_DATA_ALIGN(hh_len) otherwise.
On Ethernet, hard_header_len is 14 but the cached copy needs 16 bytes. If
an LWT_XMIT BPF program calls bpf_skb_change_head(skb, 1, 0), the skb can
still have 15 bytes of headroom after the program. The existing check
accepts that, after which neigh_hh_output() hits its headroom warning and
drops the skb.
Use LL_RESERVED_SPACE(dst->dev) in the post-BPF headroom check to match
the reservation made before LWT xmit.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 753e5cdcca5474d230d62bb3489e5168ab27c272
(git)
Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < c488071c3441fa34f5a87cd6c12ce2cc6304f20e (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < a38c0eb447e2dd0120a2ebcdba470f9505ac8907 (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < de2b2004e16f2930eb689175e2c1998b0a68d499 (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 7d043e24520a273c362be5dd7d9c82796879a49b (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 7cf561843ed0ad57501892a65abb77957e6c800f (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 179a5b2171573d94a25c9aa8e1c9f9ac352ad316 (git) Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 5fe7007aed9ad069b2bd77e5d0c875c64f5c0269 (git) |
guessed | |
| Linux | Linux |
Affected:
4.10
Unaffected: 0 , < 4.10 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
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{
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},
{
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"version": "5.15.221",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
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"versionType": "semver"
},
{
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"version": "6.12.110",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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{
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},
{
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{
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{
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{
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"negate": false,
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlwt_bpf: Restore reserved headroom after xmit program\n\nip_finish_output2() expands an skb to LL_RESERVED_SPACE(dev) before LWT\nxmit. An LWT_XMIT BPF program can then modify the skb head and still\nreturn BPF_OK, so bpf_xmit() rechecks the remaining headroom before the\nskb continues to neighbour output.\n\nThat recheck uses dst-\u003edev-\u003ehard_header_len. This is not enough for the\nneighbour cached-header path: neigh_hh_output() copies the cached hardware\nheader using the aligned hh_cache size, HH_DATA_MOD for short headers or\nHH_DATA_ALIGN(hh_len) otherwise.\n\nOn Ethernet, hard_header_len is 14 but the cached copy needs 16 bytes. If\nan LWT_XMIT BPF program calls bpf_skb_change_head(skb, 1, 0), the skb can\nstill have 15 bytes of headroom after the program. The existing check\naccepts that, after which neigh_hh_output() hits its headroom warning and\ndrops the skb.\n\nUse LL_RESERVED_SPACE(dst-\u003edev) in the post-BPF headroom check to match\nthe reservation made before LWT xmit."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T08:58:58.842Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
{
"url": "https://git.kernel.org/stable/c/753e5cdcca5474d230d62bb3489e5168ab27c272"
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{
"url": "https://git.kernel.org/stable/c/c488071c3441fa34f5a87cd6c12ce2cc6304f20e"
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{
"url": "https://git.kernel.org/stable/c/a38c0eb447e2dd0120a2ebcdba470f9505ac8907"
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{
"url": "https://git.kernel.org/stable/c/de2b2004e16f2930eb689175e2c1998b0a68d499"
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{
"url": "https://git.kernel.org/stable/c/7d043e24520a273c362be5dd7d9c82796879a49b"
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{
"url": "https://git.kernel.org/stable/c/7cf561843ed0ad57501892a65abb77957e6c800f"
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{
"url": "https://git.kernel.org/stable/c/179a5b2171573d94a25c9aa8e1c9f9ac352ad316"
},
{
"url": "https://git.kernel.org/stable/c/5fe7007aed9ad069b2bd77e5d0c875c64f5c0269"
}
],
"title": "lwt_bpf: Restore reserved headroom after xmit program",
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}
}
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"cveId": "CVE-2026-90160",
"datePublished": "2026-09-17T16:06:51.806Z",
"dateReserved": "2026-09-11T19:38:34.790Z",
"dateUpdated": "2026-10-19T08:58:58.842Z",
"state": "PUBLISHED"
},
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"date": "2026-11-09",
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"percentile": "0.12128"
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}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlwt_bpf: Restore reserved headroom after xmit program\n\nip_finish_output2() expands an skb to LL_RESERVED_SPACE(dev) before LWT\nxmit. An LWT_XMIT BPF program can then modify the skb head and still\nreturn BPF_OK, so bpf_xmit() rechecks the remaining headroom before the\nskb continues to neighbour output.\n\nThat recheck uses dst-\u003edev-\u003ehard_header_len. This is not enough for the\nneighbour cached-header path: neigh_hh_output() copies the cached hardware\nheader using the aligned hh_cache size, HH_DATA_MOD for short headers or\nHH_DATA_ALIGN(hh_len) otherwise.\n\nOn Ethernet, hard_header_len is 14 but the cached copy needs 16 bytes. If\nan LWT_XMIT BPF program calls bpf_skb_change_head(skb, 1, 0), the skb can\nstill have 15 bytes of headroom after the program. The existing check\naccepts that, after which neigh_hh_output() hits its headroom warning and\ndrops the skb.\n\nUse LL_RESERVED_SPACE(dst-\u003edev) in the post-BPF headroom check to match\nthe reservation made before LWT xmit."
}
],
"id": "CVE-2026-90160",
"lastModified": "2026-10-19T09:19:05.990",
"metrics": {},
"published": "2026-09-17T17:17:09.190",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/179a5b2171573d94a25c9aa8e1c9f9ac352ad316"
},
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"url": "https://git.kernel.org/stable/c/5fe7007aed9ad069b2bd77e5d0c875c64f5c0269"
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"url": "https://git.kernel.org/stable/c/753e5cdcca5474d230d62bb3489e5168ab27c272"
},
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7cf561843ed0ad57501892a65abb77957e6c800f"
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"url": "https://git.kernel.org/stable/c/7d043e24520a273c362be5dd7d9c82796879a49b"
},
{
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"url": "https://git.kernel.org/stable/c/a38c0eb447e2dd0120a2ebcdba470f9505ac8907"
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{
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},
{
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],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-11-06T19:53:05+00:00",
"cve": "CVE-2026-90160",
"id": "CVE-2026-90160",
"initial_release_date": "2026-09-17T00:00:00+00:00",
"product_status:known_affected": "161",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: lwt_bpf: Restore reserved headroom after xmit program",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90160.json",
"version": "3"
}
}
}
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